Txt
Design a complete schematic for an ESP32-based portable environmental data logger and playback instrument prototype.

MAIN GOAL:
The system must:
- read multiple environmental sensors,
- display real-time data on an OLED display,
- store timestamped sensor data into CSV files on a microSD card,
- provide a physical user interface with buttons and rotary encoder,
- monitor battery/power consumption,
- be powered from a USB power bank,
- and be designed as a stable, expandable embedded system prototype.

Use professional schematic practices:
- proper decoupling capacitors,
- pull-up resistors where necessary,
- stable power routing,
- connector labeling,
- test points if appropriate,
- clean modular organization.

======================================================================
MICROCONTROLLER
======================================================================

Use:
- ESP32 DevKit V1 (ESP32-WROOM-32, 38 pin)

Power logic:
- Entire system runs at 3.3V
- USB power bank input is 5V

======================================================================
POWER SYSTEM
======================================================================

Input power:
- USB-C or USB micro breakout connector for external power bank input

Include:
- Main power switch
- 3.3V voltage regulation stage from 5V input
- INA219 current/voltage sensor for battery monitoring

Recommended regulator:
- LM2596 buck converter module OR equivalent stable 3.3V regulator

Add:
- power LED
- decoupling capacitors near ESP32 and peripherals

======================================================================
SENSORS
======================================================================

1. Environmental Sensor
Use:
- BME280
Functions:
- temperature
- humidity
- pressure
- altitude estimate

Communication:
- I2C

------------------------------------------------------------

2. Light and Color Sensor
Use:
- TCS34725

Functions:
- RGB
- lux
- color temperature

Communication:
- I2C

------------------------------------------------------------

3. Accelerometer / Vibration Sensor
Use:
- ADXL345

Functions:
- XYZ acceleration
- vibration activity

Communication:
- I2C

------------------------------------------------------------

4. GPS Module
Use:
- GY-NEO6MV2 GPS module

Communication:
- UART

======================================================================
DISPLAY
======================================================================

Use:
- SSD1306 OLED display 128x64
- I2C interface

Purpose:
- real-time sensor visualization
- menu system
- recording/playback feedback
- battery indicator

======================================================================
STORAGE
======================================================================

Use:
- microSD card module

Communication:
- SPI

Purpose:
- CSV data logging
- playback data reading

======================================================================
USER INTERFACE
======================================================================

Include:

1. REC push button
2. PLAY push button
3. MODE push button
4. CALIBRATION push button

Buttons should:
- use INPUT_PULLUP logic
- connect to GND when pressed

------------------------------------------------------------

5. Rotary Encoder with push switch

Functions:
- menu navigation
- parameter editing
- playback scaling
- sensor selection

======================================================================
MIDI OUTPUT
======================================================================

Include:
- TRS MIDI OUT Type A connector

Use:
- UART TX from ESP32
- proper MIDI resistor network

Include:
- recommended professional MIDI OUT circuitry

======================================================================
AUDIO MONITOR OUTPUT
======================================================================

Include:
- MAX98357A I2S DAC/amplifier module

Output:
- stereo or mono headphone output (3.5mm jack)

Purpose:
- realtime monitoring/sonification

Include:
- volume potentiometer

======================================================================
PIN ASSIGNMENTS
======================================================================

Use the following GPIO mapping:

I2C:
- SDA → GPIO21
- SCL → GPIO22

SPI microSD:
- CS → GPIO5
- MOSI → GPIO23
- MISO → GPIO19
- SCK → GPIO18

GPS UART:
- RX → GPIO16
- TX → GPIO17

MIDI OUT:
- TX → GPIO25

I2S Audio:
- BCLK → GPIO26
- LRC → GPIO27
- DIN → GPIO14

Buttons:
- REC → GPIO32
- PLAY → GPIO33
- MODE → GPIO4
- CAL → GPIO13

Encoder:
- CLK → GPIO34
- DT → GPIO35
- SW → GPIO15

Power LED:
- GPIO2

======================================================================
IMPORTANT DESIGN REQUIREMENTS
======================================================================

- Use proper pull-up resistors for I2C bus
- Add decoupling capacitors to all major ICs/modules
- Ensure clean grounding strategy
- Keep audio section separated from noisy digital section
- Keep SD card traces stable and organized
- Label all connectors clearly
- Organize schematic into functional blocks:
  - Power
  - ESP32 Core
  - Sensors
  - Display
  - Storage
  - UI
  - MIDI
  - Audio

======================================================================
OUTPUT REQUEST
======================================================================

Generate:
1. Complete schematic
2. Component recommendations
3. Connector labels
4. Suggested decoupling values
5. Notes for PCB layout considerations
6. Any missing supporting circuitry required for stable operation